| 摘要 |
A pitch adjustment device for selectively adjusting the pitch of the string(s) of a stringed musical instrument. Each string of the instrument is attached to a respective pitch adjustment device. Each pitch adjustment device comprises a tuning key to which the string is attached. The tuning key is mounted on a pivotable lever. A pull rod is attached to the lever to selectively pivot the lever. When the pull rod is actuated, it causes the lever and the tuning key to pivot, thereby adjusting the tension or pitch of the string. While the lever and tuning key pivot, the adjustment of the tuning key relative to the lever remains unchanged. Accordingly, when the pull rod is de-actuated, the lever and tuning key return to their original position and the string returns to its normal open pitch. A roller nut having a pivoting knife-edged surface is also provided.
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